Cramp bark is an herbal remedy traditionally used to treat cramping, notes WebMD. It can alleviate all types of cramps, from muscular spasms to menstrual and pregnancy cramps. It also has a history of use for kidney and urinary conditions that involve spasms.
Cramp bark is a North American plant whose name comes from its anti-cramping properties. The chemicals in it can decrease muscle spasms, lower blood pressure and decrease heart rate. It has no known side effects or other drug interactions. However, more evidence is necessary to know how effective cramp bark is when treating each type of cramp, explains WebMD.